CN114247364B - Movable feeding device and method for keeping fluidity of anaerobic granular sludge - Google Patents
Movable feeding device and method for keeping fluidity of anaerobic granular sludge Download PDFInfo
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- CN114247364B CN114247364B CN202111400418.8A CN202111400418A CN114247364B CN 114247364 B CN114247364 B CN 114247364B CN 202111400418 A CN202111400418 A CN 202111400418A CN 114247364 B CN114247364 B CN 114247364B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/50—Movable or transportable mixing devices or plants
- B01F33/502—Vehicle-mounted mixing devices
- B01F33/5021—Vehicle-mounted mixing devices the vehicle being self-propelled, e.g. truck mounted, provided with a motor, driven by tracks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
- B01F25/51—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is circulated through a set of tubes, e.g. with gradual introduction of a component into the circulating flow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/93—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with rotary discs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a movable feeding device and a method for keeping the fluidity of anaerobic granular sludge, wherein the movable feeding device comprises a movable feeding device box body, a feeding filtering system, a primary mixing and heat insulation system, a secondary mixing and heat insulation system and a discharging system which are arranged in the movable feeding device box body, and the vibrating box body, the secondary mixing and heat insulation system and the discharging system of the flow maintenance and heat insulation system are communicated through overflow channels in sequence and are provided with heating devices for keeping the anaerobic granular sludge at a set temperature; the maintenance flow and heat preservation system is provided with a vibrating mechanism which can vibrate the box body and realize the vibration of the vibrating box body; the discharging system is provided with a discharging system discharging pipe, an anaerobic granular sludge screw pump and an anaerobic granular sludge discharging pipe, and the anaerobic granular sludge circulating pipe is connected with the anaerobic granular sludge screw pump. The invention solves the problems of anaerobic granular sludge deposition, crushing, temperature losing and the like existing in the transportation and the addition of the IC anaerobic tower anaerobic granular sludge caused by the conventional device and method.
Description
[ field of technology ]
The invention relates to the technical field of sewage treatment, in particular to a movable feeding device and method for keeping the fluidity of anaerobic granular sludge.
[ background Art ]
Due to the rapid development of modern industry, the discharge amount of industrial wastewater is drastically increased. This contaminates the existing water sources to a great extent, resulting in a continual reduction in the available water resources. This vicious circle can be alleviated only if the source of pollution is treated in the factory without contaminating nearby sources of water. The typical industrial wastewater field with serious pollution at present comprises high pollution industries such as papermaking, printing and dyeing, food, brewing and the like, and is mainly characterized in that CODcr concentration in wastewater is high, biodegradability is weak, and the wastewater treatment system is easy to break down due to overlarge load of traditional biochemical direct treatment. Therefore, aiming at the too high CODcr in the industrial wastewater treatment process, only the IC anaerobic tower is arranged at the front end of the biochemistry, and most of organic matters are converted into inorganic matters and a small amount of cellular matters through the metabolic process of anaerobic microorganisms in the reaction zone of the IC anaerobic tower under the condition that oxygen is not required to be provided, so that the purposes of removing organic pollutants in the wastewater, improving the biodegradability of the wastewater and relieving the subsequent biochemical treatment load are achieved.
In the anaerobic treatment of organic wastewater, an efficient anaerobic reactor such as an IC anaerobic tower must use anaerobic granular sludge. Anaerobic granular sludge has a stable aggregate structure, is generally spherical, ellipsoidal or potato-shaped, has a particle size of 0.2-1.5 mm, and is mostly about 0.8 mm. The color of the particles is usually grey or grey-black or light grey. The surface of the anaerobic granular sludge with good activity is smoother, pores are formed, the center of the anaerobic granular sludge is provided with obvious holes, the wet density is also larger, and the sedimentation performance is good. When the volume load of the reactor reaches 10-30 kg COD/m < 3 >. D, the catalyst still can stay in the reactor. Anaerobic granular sludge has excellent wastewater treatment performance and is strictly inoculated: firstly, adding enough anaerobic granular sludge for inoculation at one time, secondly, strictly controlling the temperature of the anaerobic granular sludge for inoculation at 35-37 ℃, and then, after the anaerobic granular sludge is put into an IC anaerobic tower, culturing for at least about 6 months (the anaerobic granular sludge transported to the site for inoculation has common performance due to water evaporation, sludge deposition, aggregate structure damage and sludge temperature loss in the transportation process, so that the culture period of the IC anaerobic tower is prolonged), wherein the anaerobic granular sludge can be cultured. The main basis for the overlong culture time of the anaerobic granular sludge is the transportation process of the anaerobic granular sludge. The conventional anaerobic granular sludge transfer mode is mainly characterized in that a tank truck is used for direct transportation, the anaerobic granular sludge is taken from a sewage treatment plant which is in normal operation to an IC anaerobic tower to be used, the transportation time is usually longer than 2 days, the strain loss of the anaerobic granular sludge transported to the site is 15-20% due to the overlong transportation time, and the domestication time of the anaerobic granular sludge is prolonged in an intangible way.
How to maintain the characteristics of anaerobic granular sludge in the transportation process and improve the activity of the anaerobic granular sludge so as to realize the rapid culture of the anaerobic granular sludge in an IC anaerobic tower, and simultaneously reduce the running cost of enterprises and society is an important subject of research in the field at present.
[ invention ]
In order to overcome the defects in the prior art, the technical problem to be solved by the invention is to provide a movable feeding device and method for keeping the fluidity of anaerobic granular sludge, and the problems of anaerobic granular sludge deposition, crushing and temperature losing in the process of conveying and feeding IC anaerobic granular sludge caused by the conventional device and method are solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the movable feeding device for keeping the fluidity of the anaerobic granular sludge comprises a movable feeding device box body, and a feeding filtering system, a primary mixing and heat insulation system, a maintenance flow and heat insulation system, a secondary mixing and heat insulation system and a discharging system which are arranged in the movable feeding device box body, wherein the feeding filtering system, the primary mixing and heat insulation system, the maintenance flow and heat insulation system, the secondary mixing and heat insulation system and the discharging system are communicated through overflow channels in sequence;
the feeding filtering system is provided with a first feeding pipe, a feeding pipe electric valve arranged on the first feeding pipe, an anaerobic granular sludge circulating pipe electric valve arranged on the anaerobic granular sludge circulating pipe, a first slag discharging pipe and a filter screen, wherein anaerobic granular sludge is discharged into the feeding filtering system through the first feeding pipe, and is filtered through the filter screen;
the primary mixing and heat preservation system is provided with a water inlet pipe, a water inlet pipe electric valve arranged on the water inlet pipe, a second deslagging pipe and a first hyperboloid stirrer, tap water is introduced into the primary mixing and heat preservation system through the water inlet pipe after the water inlet pipe electric valve is opened to adjust the water content of anaerobic granular sludge, and the anaerobic granular sludge is stirred through the first hyperboloid stirrer;
the maintenance flow and heat preservation system is provided with a vibratable box body, a vibrating mechanism for realizing the vibration of the vibratable box body, a second feeding pipe and a third slag discharging pipe which are arranged on the vibratable box body;
the secondary mixing and heat insulation system is provided with a third feeding pipe, a fourth slag discharging pipe and a second hyperboloid stirrer, and anaerobic granular sludge is stirred by the second hyperboloid stirrer;
the discharging system is provided with a fifth slag discharging pipe, a discharging system discharging pipe, an anaerobic granular sludge screw pump connected with the discharging system discharging pipe, an anaerobic granular sludge discharging pipe connected with the anaerobic granular sludge screw pump, and a discharging pipe electric valve connected with the anaerobic granular sludge discharging pipe, wherein the anaerobic granular sludge circulating pipe is connected with the anaerobic granular sludge screw pump;
the feeding filtering system, the primary mixing and heat preservation system, the maintenance flow and heat preservation system, the secondary mixing and heat preservation system and the discharging system are all provided with heating devices for keeping anaerobic granular sludge at set temperature.
Preferably, the heating device comprises a heating coil pipe arranged in the primary mixing and heat insulation system, the dimensional flow and heat insulation system, the secondary mixing and heat insulation system and the discharging system, and an electromagnetic steam generator for introducing steam into the heating coil pipe.
Preferably, the feeding filtering system, the flow maintaining and heat preserving system, the secondary mixing and heat preserving system and the discharging system are provided with thermometer on-line monitoring meters, and the thermometer on-line monitoring meters are used for controlling the electromagnetic steam generator to introduce steam into the heating coil pipe, so that the temperature of the anaerobic granular sludge is maintained in a set range.
Preferably, the vibration mechanism comprises a vibration spring set and a vibration motor of the vibration spring set.
Preferably, the feeding filtering system is provided with a water content on-line monitoring instrument, and the water content of the anaerobic granular sludge is maintained in a set range by controlling the electric valve of the water inlet pipe through the water content on-line monitoring instrument.
Preferably, the inner wall of the movable feeding device box is a steel plate with the thickness of 14mm, the outer wall is a steel plate with the thickness of 0.5-0.7 mm, and a polystyrene sandwich foam plate with the thickness of 100mm is arranged between the inner wall and the outer wall.
Preferably, the filter screen is detachably installed through the clamping groove; and the feeding filtering system is provided with a liquid level meter on-line monitoring instrument for monitoring liquid level.
The invention also provides a movable adding method for keeping the fluidity of the anaerobic granular sludge, which is realized by adopting the movable adding device for keeping the fluidity of the anaerobic granular sludge, and comprises the following steps:
step one: feeding anaerobic granular sludge into a feeding filtering system through a first feeding pipe, wherein the feeding filtering system intercepts impurities in the anaerobic granular sludge through a filter screen;
step two: the anaerobic granular sludge treated in the first step enters a primary mixing and heat preserving system, the anaerobic granular sludge keeps fluidity under the stirring action of a first hyperboloid stirrer, a heating device keeps the anaerobic granular sludge at a temperature of between 35 and 37 ℃, when the water content of the anaerobic granular sludge is lower than 95 percent, an electric valve of a water inlet pipe is opened, tap water is introduced into the primary mixing and heat preserving system through the water inlet pipe to adjust the water content of the anaerobic granular sludge, and the water content of the water inlet anaerobic granular sludge is controlled to be between 95 and 98 percent;
step three: the anaerobic granular sludge after the treatment in the second step flows into a vibratable box body of a flow maintenance and heat preservation system, vertical vibration is realized through a vibration mechanism, and the temperature of the anaerobic granular sludge is kept between 35 ℃ and 37 ℃ by a heating device;
step four: the anaerobic granular sludge after the treatment in the step three flows into a secondary mixing and heat preserving system, the anaerobic granular sludge keeps fluidity under the stirring action of a second hyperboloid stirrer, and the temperature of the anaerobic granular sludge is kept between 35 ℃ and 37 ℃ by a heating device;
step five: the anaerobic granular sludge after the treatment in the step four flows automatically into a discharging system, and a heating device continuously keeps the temperature of the anaerobic granular sludge between 35 ℃ and 37 ℃ and maintains the activity of the anaerobic granular sludge;
step six: when the temperature of the anaerobic granular sludge is lower than 35 ℃ or the water content is lower than 95%, the anaerobic granular sludge in the box body of the movable feeding device is required to be subjected to internal circulation, the electric valve of the discharging pipe is closed, the electric valve of the anaerobic granular sludge circulating pipe is opened, the screw pump of the anaerobic granular sludge is opened, and the anaerobic granular sludge discharged by the discharging pipe of the discharging system is introduced into the feeding filtering system through the anaerobic granular sludge circulating pipe to form the internal circulation of the anaerobic granular sludge.
Further, the method further comprises the step of cleaning the filter screen, when the liquid level of the feeding filtering system is lifted to the set height, the movable feeding device box stops feeding, the filter screen is detached from the movable feeding device box and is washed by the pressure water gun, and the filter screen interception function is recovered.
Further, the method further comprises the step of cleaning the box body of the movable feeding device, wherein the first slag discharging pipe, the second slag discharging pipe, the third slag discharging pipe, the fourth slag discharging pipe and the valve on the fifth slag discharging pipe are sequentially opened, residual anaerobic granular sludge liquid in the box body of the movable feeding device is emptied, the valve on each slag discharging pipe is closed after the emptying is completed, the inner wall of the box body of the movable feeding device is flushed by a pressure water gun, the valve on each slag discharging pipe is opened, and the flushing water is sequentially emptied.
By adopting the technical scheme, the invention has the following beneficial effects:
according to the sludge characteristics, a feeding filtering system, a primary mixing and heat preservation system, a maintenance flow and heat preservation system, a secondary mixing and heat preservation system and a discharging system are arranged, wherein the maintenance flow and heat preservation system can vibrate a box body, a vibration mechanism and a high-efficiency hyperboloid stirrer combination in the primary mixing and heat preservation system and the secondary mixing and heat preservation system can maintain the fluidity of anaerobic granular sludge, and meanwhile, the stable granular structure of the anaerobic granular sludge is not damaged.
The feeding filtering system, the primary mixing and heat preservation system, the maintenance flow and heat preservation system, the secondary mixing and heat preservation system and the discharging system are all provided with heating devices, so that anaerobic granular sludge is kept at a certain temperature.
The anaerobic granular sludge circulation pipe enables materials to form internal circulation all the time in the transportation process to prevent anaerobic granular sludge from depositing, finally improves the activity of the anaerobic granular sludge, enables the anaerobic granular sludge coming from a distant way to be rapidly cultured in the IC anaerobic tower, and achieves the purposes of time saving, labor saving and cost reduction.
Therefore, the problems of sedimentation, crushing, temperature loss and the like of the anaerobic granular sludge in the process of conveying and adding the anaerobic granular sludge in the IC anaerobic tower caused by the conventional device and method are solved, and the purposes of maintaining the fluidity, the certain temperature and the certain water content of the anaerobic granular sludge, improving the activity of the anaerobic granular sludge, realizing the rapid culture of the anaerobic granular sludge in the IC anaerobic tower, saving time and labor and reducing the cost are achieved.
In addition, the transportation engineering saves labor, saves the cultivation time of anaerobic granular sludge in an IC anaerobic tower, reduces the consumption of human resources during debugging, and reduces the strain consumption from 15-20% to 5-10%.
The automatic conveying device has the advantages of high automation degree, advanced and reliable functions, less operation and maintenance, long-term continuous automatic operation and the like, is convenient to transport, and saves cost in the long term.
These features and advantages of the present invention will be disclosed in detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a block diagram of the structure of the present invention;
fig. 2 is a specific structural view of the present invention.
In the figure: a feed filtration system 1; a first feed tube 13; an anaerobic granular sludge circulation pipe 14; a first slag discharge pipe 15; an anaerobic granular sludge feed pipe electric valve 16; an anaerobic granular sludge circulation pipe electric valve 17; a primary mixing and heat preservation system 2; a tap water inlet pipe 21; a tap water inlet pipe electric valve 22; a second slag discharging pipe 23; a manhole 24; the maintenance flow and heat preservation system can vibrate the box body 3; a second feed tube 31; a third slag discharging pipe 32; a vibration spring set 33 of the maintenance flow and insulation system box body; a secondary mixing and heat preservation system 4; a third feed tube 41; a fourth slag discharging pipe 42; a discharging system 5; a fifth slag discharging pipe 51; a discharge system discharge pipe 52; an anaerobic granular sludge discharge pipe 53; a discharge pipe electric valve 54; a filter screen 6; a clamping groove 7; a hyperboloid stirrer 8; a heating coil 9; an anaerobic granular sludge screw pump 10; an electrical control box 11; a movable dosing device housing 12; an electromagnetic steam generator 18.
[ detailed description ] of the invention
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
Those skilled in the art will appreciate that the features of the examples and embodiments described below can be combined with one another without conflict.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The words "upper", "lower", "left", "right", and the like, which refer to an orientation or positional relationship as follows, are merely based on the orientation or positional relationship shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices/elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
Aiming at the anaerobic granular sludge, a movable feeding device and a method for keeping the fluidity of the anaerobic granular sludge are arranged according to the characteristics of the anaerobic granular sludge, so that the quality of the anaerobic granular sludge can be kept while the transportation is convenient.
The invention is described in further detail below with reference to the attached drawings and detailed description:
example 1
The embodiment provides a movable feeding device for keeping fluidity of anaerobic granular sludge, which is shown in fig. 1 and comprises a feeding and filtering system 1, a primary mixing and heat insulation system 2, a dimension flow and heat insulation system vibratable box body 3, a secondary mixing and heat insulation system 4 and a discharging system 5.
As shown in fig. 2, in the feed filtration system 1, the feed filtration system 1 is provided with a first feed pipe 13, an anaerobic granular sludge circulation pipe 14, a first slag discharge pipe 15, an anaerobic granular sludge feed pipe electric valve 16, and an anaerobic granular sludge circulation pipe electric valve 17, the first feed pipe 13 is connected at the top of the left side of the feed filtration system 1 above the average liquid level, and the first feed pipe 13 is directly connected to the bottom of the feed filtration system 1, the anaerobic granular sludge circulation pipe 14 is connected from an anaerobic granular sludge discharge pipe 53 to the first feed pipe 13, and the first slag discharge pipe 15 is arranged at the bottom of the feed filtration system 1. The specification of the first feeding pipe 13 is DN150, the specification of the anaerobic granular sludge circulation pipe 14 is DN150, the specification of the first slag discharging pipe 15 is DN200, the specification of the anaerobic granular sludge feeding pipe electric valve 16 is DN150, and the specification of the anaerobic granular sludge circulation pipe electric valve 17 is DN150. Opening an anaerobic granular sludge feed pipe electric valve 16, discharging anaerobic granular sludge into the feed filtration system 1 through the first feed pipe 13, opening an anaerobic granular sludge circulation pipe electric valve 17 according to the requirement, and introducing the anaerobic granular sludge at the tail end of the system into the feed filtration system 1 through the anaerobic granular sludge circulation pipe 14 to form the internal circulation of the whole system, so that anaerobic granular sludge deposition is avoided, the fluidity and activity of the anaerobic granular sludge are maintained, and the anaerobic granular sludge coming from a far way can be rapidly cultivated in an IC anaerobic tower, thereby achieving the purposes of saving time and labor and reducing cost. The feeding filtering system 1 is connected with a filter screen 6 arranged between the primary mixing and heat preserving system 2.
The filter screen 6 is made of stainless steel materials and is detachably arranged in the clamping groove 7, and the specification of the filter screen is 4 meshes. The stainless steel filter screen can prevent impurities such as plastic bags, fiber garbage and the like in the anaerobic granular sludge from blocking pipelines, sludge pumps, IC anaerobic tower water distributors and the like.
As shown in fig. 2, a tap water inlet pipe 21, a tap water inlet pipe electric valve 22, a second deslagging pipe 23, a manhole 24, a hyperboloid stirrer 8, a heating coil 9 and an electromagnetic steam generator 18 are arranged in the primary mixing and heat preservation system 2, the specification DN20 of the tap water inlet pipe 21 is communicated from the top to the bottom of the primary mixing and heat preservation system 2, the tap water inlet pipe 21 is provided with the tap water inlet pipe electric valve 22, the specification 22DN20, the specification DN200 of the second deslagging pipe 23 is positioned at the bottom of the primary mixing and heat preservation system 2, the manhole 24 specification phi 800mm is positioned at the top of the primary mixing and heat preservation system 2, and the parameter evaporation capacity of the electromagnetic steam generator 18 is 110kg/h, the rated working pressure is 0.7mpa, the steam temperature is 170 ℃ and the power is 80kw/h is positioned at the top of the primary mixing and heat preservation system 2. The hyperboloid stirrer 8 is supported by the channel steel bracket at the top of the primary mixing and heat insulation system 2, and the three-dimensional spiral stirring flow state of the hyperboloid stirrer 8 has the advantages of uniformity, high efficiency, energy conservation, softness and the like, the structure and the installation position close to the bottom of the tank determine the anti-sedimentation effect and large-area water body exchange, the stirring dead angle can be effectively eliminated, anaerobic granular sludge is not cut up in the stirring process, the stable granular structure of the anaerobic granular sludge is maintained and the like. The heating coil pipe 9 is in DN25 specification, the heating coil pipe 9 is arranged around the inner wall of the box body of the primary mixing and heat preservation system 2 at a certain interval, and the electromagnetic steam generator 18 is started to introduce steam into the primary mixing and heat preservation system 2 so as to keep the temperature of anaerobic granular sludge between 35 ℃ and 37 ℃. According to the requirement, the electric valve 22 of the tap water inlet pipe is opened, tap water is injected into the primary mixing and heat insulation system 2, and the water content of the anaerobic granular sludge is adjusted to be 95-98%. The primary mixing and heat preservation system 2 is connected with the vibrating box body 3 of the dimensional flow and heat preservation system through a first partition board.
As shown in fig. 2, a second feeding pipe 31, a third slag discharging pipe 32, a vibrating spring group 33 of the vibrating box body of the maintenance flow and heat preservation system, a heating coil pipe 9 and a manhole 24 are arranged in the vibrating box body 3 of the maintenance flow and heat preservation system. The second feeding pipe 31 is in specification DN150, is positioned at the top of the side surface of the vibrating box body 3 of the dimension flow and heat preservation system, the third deslagging pipe 32 is in specification DN200, is positioned at the bottom of the vibrating box body 3 of the dimension flow and heat preservation system, the dimension flow and heat preservation system box body vibrating spring group 33 is positioned between the vibrating box body 3 of the dimension flow and heat preservation system and the movable feeding device box body 12, the dimension flow and heat preservation system vibrating box body 3 is driven to vibrate up and down through a vibrating motor of the dimension flow and heat preservation system box body vibrating spring group 33, and the amplitude interval is 5-10 mm, so that anaerobic granular sludge in the vibrating box body has certain fluidity, and meanwhile, the stable granular structure of the anaerobic granular sludge is not damaged. The manhole 24 is of a specification phi 800mm and is positioned at the top of the vibrating box body 3 of the maintenance flow and heat preservation system. The heating coil pipe 9 is in DN25 specification, the heating coil pipe 9 is arranged at a certain interval around the inner wall of the vibrating box body 3 of the flow maintaining and heat preserving system, the electromagnetic steam generator 18 is started to introduce steam into the vibrating box body 3 of the flow maintaining and heat preserving system, so that the temperature of the anaerobic granular sludge is kept between 35 ℃ and 37 ℃. The vibration box body 3 of the dimension flow and heat preservation system is connected with the secondary mixing and heat preservation system 4 through a second partition board.
As shown in fig. 2, a third feeding pipe 41, a fourth slag discharging pipe 42, a hyperboloid stirrer 8, a heating coil 9 and a manhole 24 are arranged in the secondary mixing and heat insulation system 4. The third feeding pipe 41 is in specification DN150 and is positioned at the top of the side surface of the secondary mixing and heat preservation system 4, the third feeding pipe 41 is directly communicated with the bottom of the secondary mixing and heat preservation system 4, and the fourth deslagging pipe 42 is in specification DN200 and is positioned at the bottom of the secondary mixing and heat preservation system 4. The hyperboloid stirrer 8 is supported by the channel steel bracket at the top of the secondary mixing and heat insulation system 4. The heating coil pipe 9 is in DN25 specification, the heating coil pipe 9 is arranged around the inner wall of the box body of the secondary mixing and heat preservation system 4 at certain intervals, and the electromagnetic steam generator 18 is started to introduce steam into the secondary mixing and heat preservation system 4 so as to keep the temperature of the anaerobic granular sludge between 35 ℃ and 37 ℃. The manhole 24 is of a specification phi 800mm and is positioned at the top of the secondary mixing and heat insulation system 4. The second-level mixing and heat preservation system 4 is connected with the discharging system 5 through a third partition board, and anaerobic granular sludge overflows to the discharging system 5 through the top of the third partition board.
As shown in fig. 2, a fifth slag discharging pipe 51, a discharging system discharging pipe 52, an anaerobic granular sludge discharging pipe 53, an anaerobic granular sludge discharging pipe electric valve 54, a heating coil 9 and an anaerobic granular sludge screw pump 10 are arranged in the discharging system 5. The fifth slag discharging pipe 51 specification DN200 is positioned at the bottom of the discharging system 5, the discharging pipe 52 specification DN150 of the discharging system is positioned at the bottom of the side surface of the discharging system 5, the right side of the discharging system is connected with the anaerobic granular sludge screw pump 10, the anaerobic granular sludge screw pump is actually one of positive displacement pumps, and the anaerobic granular sludge screw pump mainly utilizes the rotation of an eccentric single-screw in a double-screw bushing to push anaerobic granular sludge liquid to a discharge port from a suction inlet along a spiral groove, so that the anaerobic granular sludge is cut up by using a centrifugal pump in a high-speed rotation way. The anaerobic granular sludge discharging pipe 53 is connected to an IC anaerobic tower through a pump, anaerobic granular sludge is added through opening and closing the electric valve 54 of the anaerobic granular sludge discharging pipe, the anaerobic granular sludge screw pump 10 is connected with the anaerobic granular sludge circulating pipe 14 and is led to the feed filtering system 1, so that the anaerobic granular sludge always forms internal circulation in the transportation process to prevent the deposition of the anaerobic granular sludge. The heating coil pipe 9 is in DN25 specification, the heating coil pipe 9 is arranged around the inner wall of the box body of the discharging system 5 at a certain interval, and the electromagnetic steam generator 18 is started to introduce steam into the discharging system 5 so as to keep the temperature of the anaerobic granular sludge between 35 ℃ and 37 ℃.
The movable feeding device can maintain the fluidity of anaerobic granular sludge under the combination of the vibrating box body, the vibrating mechanism, the primary mixing and heat preserving system and the high-efficiency hyperboloid stirrer in the secondary mixing and heat preserving system in the maintenance flow and heat preserving system, and meanwhile, the stable aggregate structure of the anaerobic granular sludge is not damaged.
And the feeding filtering system, the primary mixing and heat preservation system, the maintenance flow and heat preservation system, the secondary mixing and heat preservation system and the discharging system are all provided with heating devices, so that anaerobic granular sludge is kept at a certain temperature.
The movable feeding device is characterized in that the top of the first-stage mixing and heat preservation system, the maintenance flow and heat preservation system and the top of the second-stage mixing and heat preservation system box body are respectively provided with a manhole, wherein the manhole is 800mm in diameter, and the manholes are used for workers to observe the running condition of equipment in the box body, so that faults can be removed conveniently and timely.
The anaerobic granular sludge feeding pipe, the anaerobic granular sludge circulating pipe, the tap water inlet pipe and the anaerobic granular sludge discharging pipe are all provided with electric valves, signals are connected to the movable feeding device electric control box 11, and the electric valves are automatically controlled to start and stop.
It is understood that valves are arranged on the first slag discharging pipe, the second slag discharging pipe, the third slag discharging pipe, the fourth slag discharging pipe and the fifth slag discharging pipe, and normally closed, and the valves are opened to empty the cleaning water according to the requirement during cleaning.
The inner wall of the box body of the movable feeding device is a steel plate with the thickness of 14mm, the outer wall is a color steel plate with the thickness of 0.5-0.7 mm, a polystyrene sandwich foam plate with the thickness of 100mm is arranged between the inner wall and the outer wall for heat preservation, the ratio range of the length to the width of the box body is 3:1:1.2, the length range of the box body is 9-12 m, and the effective volume is more than or equal to 80m 3 。
Further, the inner wall of the box body of the movable adding device is provided with a wear-resistant coating, a polyurethane 3-layer wear-resistant structure is adopted, the composition of the polyurethane 3-layer wear-resistant structure is polyurethane priming paint, polyurethane paint, special curing agent and polyurethane paint diluent are coated in one step, polyurethane finish paint is coated in one step, each step of coating is vertically coated on the basis of the last step, and the dry film thickness is more than or equal to 1.5mm.
Embodiment two:
the embodiment provides a movable adding method for keeping fluidity of anaerobic granular sludge, as shown in fig. 1 and fig. 2, implemented by adopting the movable adding device for keeping fluidity of anaerobic granular sludge provided in the first embodiment, comprising the following steps:
step one: the movable feeding device for keeping the fluidity of the anaerobic granular sludge is driven to a sewage treatment plant which normally operates, an electric valve 16 of an anaerobic granular sludge feeding pipe is opened, the anaerobic granular sludge (the combination of digested sludge, aerobic sludge and dehydrated sludge) with the water content of 95-98% of the sewage treatment plant is pumped into a feeding filtering system 1, the anaerobic granular sludge intercepts impurities such as plastic bags, fiber wastes and the like in the anaerobic granular sludge through a filter screen 6, the blocking of a subsequent pump and a heating coil is avoided, the water content of the water-feeding anaerobic granular sludge is 95-98%, and the temperature is 32-35 ℃.
Step two: the anaerobic granular sludge treated in the first step enters a first-stage mixing and heat insulation system 2, the rotating speed of a hyperboloid stirrer 8 is 10-15 r/min, and the anaerobic granular sludge keeps fluidity under the stirring action of the hyperboloid stirrer 8. The feeding filtering system 1 is provided with a water content on-line monitoring instrument, the running water inlet pipe electric valve 22 is controlled by the on-line water content instrument, when the water content of the anaerobic granular sludge is lower than 95% -98%, the running water inlet pipe electric valve 22 is opened, tap water is introduced into the primary mixing and heat insulation system 2 through the running water inlet pipe 21 to adjust the water content of the anaerobic granular sludge, and when the water content of the anaerobic granular sludge is between 95% -98%, the running water inlet pipe electric valve 22 is not opened. The feeding filtering system 1 is provided with a thermometer on-line monitoring instrument, the thermometer on-line monitoring instrument is used for controlling the electromagnetic steam generator 18, when the temperature of anaerobic granular sludge is lower than 35-37 ℃, the electromagnetic steam generator 18 is started, steam is introduced into the primary mixing and heat preservation system 2 through the heating coil 9 to adjust the temperature of the anaerobic granular sludge to 35-37 ℃, and when the temperature of the anaerobic granular sludge of the inlet water is between 35-37 ℃, the electromagnetic steam generator 18 is not started. The water content of the inlet anaerobic granular sludge is 95-98%, the temperature is 32-35 ℃, the water content of the outlet anaerobic granular sludge is 95-98%, and the temperature is 35-37 ℃.
Step three: the anaerobic granular sludge after the treatment in the step two flows into the vibrating box body 3 of the flow maintaining and heat preserving system, the up and down vibration of the vibrating spring group 33 is arranged through the box body of the flow maintaining and heat preserving system, and the steam is introduced into the electromagnetic steam generator 18, so that the anaerobic granular sludge keeps certain fluidity and certain temperature, and the granular structure of the anaerobic granular sludge is not damaged. The dimension flow and heat preservation system vibratable box body 3 is provided with a dimension flow and heat preservation system box body vibrating spring group 33 which is positioned between the dimension flow and heat preservation system vibratable box body 3 and the movable feeding device box body 12, and the upper and lower amplitude is between 5 and 10 mm. The dimension flows and the heat preservation system can vibrate the box 3 and is equipped with the thermometer on-line monitoring instrument, allies oneself with the electromagnetic steam generator 18 through the thermometer on-line monitoring instrument and controls, opens electromagnetic steam generator 18 to through heating coil 9 to dimension flows and the heat preservation system can vibrate box 3 and let in steam adjust anaerobic granule mud temperature to 35-37 ℃ to the dimension, when intaking anaerobic granule mud temperature between 35-37 ℃, electromagnetic steam generator 18 does not open. The water content of the inlet anaerobic granular sludge is 95-98%, the temperature is 35-37 ℃, the water content of the outlet anaerobic granular sludge is 95-98%, and the temperature is 35-37 ℃.
Step four: the anaerobic granular sludge after the treatment in the step three flows into the secondary mixing and heat preservation system 4, and steam is introduced into the electromagnetic steam generator 18 through the soft stirring of the hyperboloid stirrer 8, so that the anaerobic granular sludge keeps certain fluidity and certain temperature continuously, and the granular structure of the anaerobic granular sludge is not damaged. The rotating speed of the hyperboloid stirrer 8 is 5-10 r/min. The anaerobic granular sludge is kept flowing under the stirring action of the hyperboloid stirrer 8. And starting an electromagnetic steam generator 18, and introducing steam into the secondary mixing and heat preservation system 4 through a heating coil 9 to maintain the temperature of the anaerobic granular sludge between 35 ℃ and 37 ℃. The water content of the inlet anaerobic granular sludge is 95-98%, the temperature is 35-37 ℃, the water content of the outlet anaerobic granular sludge is 95-98%, and the temperature is 35-37 ℃.
Step five: the anaerobic granular sludge treated in the fourth step flows into the discharging system 5 from the top of the third partition board, the discharging system 5 is provided with a thermometer on-line instrument, steam is introduced into the discharging system 5 through the electromagnetic steam generator 18 and the heating coil 9, the anaerobic granular sludge is kept at a certain temperature, and the activity of the anaerobic granular sludge is maintained. The movable feeding device for keeping the fluidity of the anaerobic granular sludge is driven to the vicinity of the IC anaerobic tower, the electric valve 54 of the anaerobic granular sludge discharging pipe and the screw pump 10 of the anaerobic granular sludge are sequentially opened, and the anaerobic granular sludge liquid with a certain granular structure, the water content of 95-98% and the temperature of 35-37 ℃ is pumped to the IC anaerobic tower, so that the aim of remote transportation of the anaerobic granular sludge is fulfilled.
Step six: when the temperature of the anaerobic granular sludge is lower than 35 ℃ or the water content is lower than 95%, the anaerobic granular sludge in the box body 12 of the movable feeding device needs to be internally circulated. And (3) closing the electric valve 54 of the anaerobic granular sludge discharging pipe, opening the electric valve 17 of the anaerobic granular sludge circulating pipe, and opening the anaerobic granular sludge screw pump 10, wherein the anaerobic granular sludge at the tail end of the system is introduced into the feed filtering system 1 through the anaerobic granular sludge circulating pipe 14, so that the internal circulation of the whole system is formed, the deposition of the anaerobic granular sludge in the transportation process is avoided, and the activity of the anaerobic granular sludge is maintained.
Step seven: the filter screen 6 is fixed in the movable feeding device box 12 through the clamping groove 7, and impurities such as plastic bags, fiber garbage and the like trapped on the filter screen 6 are gradually increased along with the use time, so that the liquid level of the feeding filter system 1 is raised, the filter screen 6 is required to be cleaned at the moment for ensuring the effective filtering efficiency, and the detachable filter screen 6 is pulled out of the movable feeding device box 12 to be washed by a pressure water gun, so that the trapping function of the filter screen 6 is recovered. The setting of the flushing period is considered according to the liquid level lifting height of the feed filtration system 1, when the liquid level difference detected by the on-line monitoring instrument of the feed filtration system liquid level meter reaches 200mm, the box body 12 of the movable feeding device stops feeding, and the filter screen 6 needs to be flushed.
Step eight: after long-term soaking and transportation of anaerobic granular sludge, the inner wall of the box body 12 of the movable adding device can generate a large-scale sludge phenomenon, and the box body 12 of the movable adding device needs to be cleaned at the moment. Firstly, sequentially opening valves on a first deslagging pipe 15, a second deslagging pipe 23, a third deslagging pipe 32, a fourth deslagging pipe 42 and a fifth deslagging pipe 51, evacuating residual anaerobic granular sludge liquid in a movable dosing device box 12, closing the valves on the deslagging pipes after the evacuation is completed, flushing the inner wall of the movable dosing device box 12 by using a pressure water gun, opening the valves on the deslagging pipes, sequentially evacuating flushing water, and if necessary, closing the valves on the deslagging pipes to flush the inner wall of the movable dosing device box 12 again until the inside of the box is completely flushed. The flushing water is discharged to a nearby sewage drain pipe in the factory.
In summary, the invention solves the problems of anaerobic granular sludge deposition, crushing, losing temperature and the like in the process of transporting and adding the anaerobic granular sludge in the IC anaerobic tower caused by the conventional device and method, and aims to maintain the fluidity, the certain temperature and the certain water content of the anaerobic granular sludge, improve the activity of the anaerobic granular sludge, realize the rapid culture of the anaerobic granular sludge in the IC anaerobic tower, and achieve the purposes of time saving, labor saving and cost reduction.
In addition, the transportation engineering saves labor, saves the cultivation time of anaerobic granular sludge in an IC anaerobic tower, reduces the consumption of human resources during debugging, and reduces the strain consumption from 15-20% to 5-10%.
The automatic conveying device has the advantages of high automation degree, advanced and reliable functions, less operation and maintenance, long-term continuous automatic operation and the like, is convenient to transport, and saves cost in the long term.
While the invention has been described in terms of specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited thereto but includes, but is not limited to, the drawings and the description of the specific embodiments. Any modifications which do not depart from the functional and structural principles of the invention are intended to be included within the scope of the appended claims.
Claims (10)
1. The movable feeding device for keeping the fluidity of the anaerobic granular sludge is characterized by comprising a movable feeding device box body, and a feeding filtering system, a primary mixing and heat insulation system, a maintenance flow and heat insulation system, a secondary mixing and heat insulation system and a discharging system which are arranged in the movable feeding device box body, wherein the feeding filtering system, the primary mixing and heat insulation system, the maintenance flow and heat insulation system, the secondary mixing and heat insulation system and the discharging system are communicated through overflow channels in sequence;
the feeding filtering system is provided with a first feeding pipe, a feeding pipe electric valve arranged on the first feeding pipe, an anaerobic granular sludge circulating pipe electric valve arranged on the anaerobic granular sludge circulating pipe, a first slag discharging pipe and a filter screen, wherein anaerobic granular sludge is discharged into the feeding filtering system through the first feeding pipe, and is filtered through the filter screen;
the primary mixing and heat preservation system is provided with a water inlet pipe, a water inlet pipe electric valve arranged on the water inlet pipe, a second deslagging pipe and a first hyperboloid stirrer, tap water is introduced into the primary mixing and heat preservation system through the water inlet pipe after the water inlet pipe electric valve is opened to adjust the water content of anaerobic granular sludge, and the anaerobic granular sludge is stirred through the first hyperboloid stirrer;
the maintenance flow and heat preservation system is provided with a vibratable box body, a vibrating mechanism for realizing the vibration of the vibratable box body, a second feeding pipe and a third slag discharging pipe which are arranged on the vibratable box body;
the secondary mixing and heat insulation system is provided with a third feeding pipe, a fourth slag discharging pipe and a second hyperboloid stirrer, and anaerobic granular sludge is stirred by the second hyperboloid stirrer;
the discharging system is provided with a fifth slag discharging pipe, a discharging system discharging pipe, an anaerobic granular sludge screw pump connected with the discharging system discharging pipe, an anaerobic granular sludge discharging pipe connected with the anaerobic granular sludge screw pump, and a discharging pipe electric valve connected with the anaerobic granular sludge discharging pipe, wherein the anaerobic granular sludge circulating pipe is connected with the anaerobic granular sludge screw pump;
the feeding filtering system, the primary mixing and heat preservation system, the maintenance flow and heat preservation system, the secondary mixing and heat preservation system and the discharging system are all provided with heating devices for keeping anaerobic granular sludge at set temperature.
2. The movable feeding device for keeping fluidity of anaerobic granular sludge according to claim 1, wherein the heating device comprises a heating coil pipe arranged in a primary mixing and heat preservation system, a secondary mixing and heat preservation system and a discharging system, and an electromagnetic steam generator for introducing steam into the heating coil pipe.
3. The movable feeding device for keeping the fluidity of the anaerobic granular sludge according to claim 2, wherein the feeding filtering system, the flow maintaining and heat preserving system, the secondary mixing and heat preserving system and the discharging system are provided with thermometer on-line monitoring meters, and the thermometer on-line monitoring meters are used for controlling the electromagnetic steam generator to introduce steam into the heating coil pipe, so that the temperature of the anaerobic granular sludge is maintained in a set range.
4. The movable dosing device for maintaining the fluidity of anaerobic granular sludge according to claim 1, wherein the vibration mechanism comprises a vibration spring group and a vibration motor provided with the vibration spring group.
5. The movable feeding device for keeping the fluidity of the anaerobic granular sludge according to claim 1, wherein the feeding filtering system is provided with a water content on-line monitoring instrument, and the water content of the anaerobic granular sludge is kept in a set range by controlling an electric valve of a water inlet pipe through the water content on-line monitoring instrument.
6. The movable feeding device for keeping the fluidity of anaerobic granular sludge according to claim 1, wherein the inner wall of a box body of the movable feeding device is a steel plate with the thickness of 14mm, the outer wall is a steel plate with the thickness of 0.5-0.7 mm, and a polystyrene sandwich foam plate with the thickness of 100mm is arranged between the inner wall and the outer wall.
7. The movable feeding device for maintaining fluidity of anaerobic granular sludge according to claim 1, wherein the filter screen is detachably installed through a clamping groove; and the feeding filtering system is provided with a liquid level meter on-line monitoring instrument for monitoring liquid level.
8. A movable dosing method for maintaining the fluidity of anaerobic granular sludge, which is realized by the movable dosing device for maintaining the fluidity of anaerobic granular sludge according to any one of claims 1 to 7, and is characterized by comprising the following steps:
step one: feeding anaerobic granular sludge into a feeding filtering system through a first feeding pipe, wherein the feeding filtering system intercepts impurities in the anaerobic granular sludge through a filter screen;
step two: the anaerobic granular sludge treated in the first step enters a primary mixing and heat preserving system, the anaerobic granular sludge keeps fluidity under the stirring action of a first hyperboloid stirrer, a heating device keeps the anaerobic granular sludge at a temperature of between 35 and 37 ℃, when the water content of the anaerobic granular sludge is lower than 95 percent, an electric valve of a water inlet pipe is opened, tap water is introduced into the primary mixing and heat preserving system through the water inlet pipe to adjust the water content of the anaerobic granular sludge, and the water content of the water inlet anaerobic granular sludge is controlled to be between 95 and 98 percent;
step three: the anaerobic granular sludge after the treatment in the second step flows into a vibratable box body of a flow maintenance and heat preservation system, vertical vibration is realized through a vibration mechanism, and the temperature of the anaerobic granular sludge is kept between 35 ℃ and 37 ℃ by a heating device;
step four: the anaerobic granular sludge after the treatment in the step three flows into a secondary mixing and heat preserving system, the anaerobic granular sludge keeps fluidity under the stirring action of a second hyperboloid stirrer, and the temperature of the anaerobic granular sludge is kept between 35 ℃ and 37 ℃ by a heating device;
step five: the anaerobic granular sludge after the treatment in the step four flows automatically into a discharging system, and a heating device continuously keeps the temperature of the anaerobic granular sludge between 35 ℃ and 37 ℃ and maintains the activity of the anaerobic granular sludge;
step six: when the temperature of the anaerobic granular sludge is lower than 35 ℃ or the water content is lower than 95%, the anaerobic granular sludge in the box body of the movable feeding device is required to be subjected to internal circulation, the electric valve of the discharging pipe is closed, the electric valve of the anaerobic granular sludge circulating pipe is opened, the screw pump of the anaerobic granular sludge is opened, and the anaerobic granular sludge discharged by the discharging pipe of the discharging system is introduced into the feeding filtering system through the anaerobic granular sludge circulating pipe to form the internal circulation of the anaerobic granular sludge.
9. The method according to claim 8, further comprising the step of cleaning the filter screen, stopping feeding the filter screen when the liquid level of the feed filter system rises to a predetermined level, removing the filter screen from the housing of the movable feeder, and flushing the filter screen with a pressure water gun to restore the filter screen retention function.
10. The movable feeding method for maintaining the fluidity of the anaerobic granular sludge according to claim 8, further comprising the steps of cleaning the box body of the movable feeding device, firstly sequentially opening valves on a first slag discharging pipe, a second slag discharging pipe, a third slag discharging pipe, a fourth slag discharging pipe and a fifth slag discharging pipe, evacuating residual anaerobic granular sludge liquid in the box body of the movable feeding device, closing the valves on the slag discharging pipes after the evacuation is completed, flushing the inner wall of the box body of the movable feeding device by using a pressure water gun, opening the valves on the slag discharging pipes, and sequentially evacuating flushing water.
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| CN202310757739.6A CN116808898A (en) | 2021-11-24 | 2021-11-24 | Anaerobic granular sludge mobile feeding equipment for organic wastewater treatment |
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| CN114247364A (en) | 2022-03-29 |
| CN116808898A (en) | 2023-09-29 |
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